Question

the area of circle is 81 π sq cm find the length of arc then angle is 300°​

Answer 1

Step-by-step explanation:

Let, the radius of the circle is r cm.

so, serface area of the circle is 4 π r² cm².

According to the condition,

4 π r² = 81 π

or, r² = 81 / 4.

The length of the arc when angel is 300°

= ( 300 / 360 ) × 4 π r²

= 270 π / 4.